Joseph s



(No Model.) I

- J. S. ASH.

DISK FOR GRINDING MILLS.

No. 361,252. Patented Apr. 19, 1887.

I WITNESSES; MM fl w.

UNITED STATE PATENT OFFI E.

JOSEPH ASH, or CANAL WINCHESTER, OHIO, ASSIGNOR or oNn-HArr TO CHARLES B. GOWAN, on SAME PLACE.

DISK FOR GRINDING-MILLS.

SPECIFICATION forming part of Letters Patent No. 361,252, dated April 19, 1887.

Application filed April 29, 1886.

Serial No. 200,539. (No model.)

To, aZZ whom it may concern.-

Be it known that I, J osnrn S. ASH, a citizen of the United States, residing at Canal Winchester, in the county of Franklin and State of Ohio, haveinvented acertain new and useful Improvement in Disks for Grinding- Mills, of which the followingis a specification.

My invention relates to that class of disks for grinding-mills wherein two disks having marginal corrugationsare used, one of said disks being made to revolve opposite to the other; and the objects of my invention are to prevent attrition of the grain while traveling to the grindingsurfaces, so much desired by r 5 millers, and to prevent unnecessary friction between the disks, thus saving power and aid ing in keeping the stock cool, and lessening the production of break-flour, andalso to increase the quantity and produce a superior quality of middlings. These objects I accomplish by the means illustrated in the accompanying drawings, in which- Figure 1 is a plan view of the lower revolving disk. Fig. 2 is a bottom View of the upper stationary disk, and Fig. 3 is a sectional view of the disks in operative position.

Similar letters refer to siinilar parts throughout the several views.

A represents'the lower revolvingdisk, having its skirt a or upper surface about the margin provided with corrugations of uniform size and depth extending obliquely inwardly from the outer edge of the disk. These corrugations may vary in size and depth on differ- 5 ent'disks, according to the stage of reduction reached by the grain. The upper surface of the disk A is cone-shaped, but concaved, being beveled inwardly and upwardly to form a smooth but concave and upwardly-tapering 40 surface fronithe outer ends of the corrugations until a central point is reached, which forms the smooth and rounded apex a of the cone.

The upper disk, B, is provided with similar, although preferably somewhat shorter, 5 corrugations, b, on its under side, extending from its outer edge obliquely inward, and has its lower surface, from the outer ends of the corrugations b, beveled and curved inwardly and upwardly toward the center of the disk.

on a lower level than the apex of the cone, in

which is formed the usual opening, 0, for the reception of the neck of the hopper.

The convex bevel of the bosom of the disk Bis of such depth that when the two disks are placed in position the points of approximate contact are only at or near the outer ends of the corrugations, sufficient space being left in the tapering passage 0* between the disks to allow the grain to slide down the concave curve, forming the incline of the cone, to said contact-points, wherethegrindingof thegrain is accomplished by the friction of the corrugations.

The corrugations I) on the upper disk, B, are arranged obliquely and in opposite directions 6 from those on the disk A, so that when the parts are brought together the ridges of the corrugations cross each other.

The upper disk is fixed in the usual manner to the frame-work of the mill, and the lower disk is secured by any well-known means to the shaft-head.

It will readily be seen that the grain passing through the hopper into the opening 0 of the upper disk, B, willdistribute itself around 7 the concave incline of the upper portion of the cone of the lower disk, and will easily slip down the smooth incline thereof to the grinding-surfaces without danger of attrition, and that the grain will be fed onto said grinding- 250 surfaces evenly. The points of contact of the corrugations being at their outer ends, it will be seen that the mangling or grinding of the grain is done just before the latter leaves the disks, thus lessening the chances of the grain being ground into break-flour before its discharge. ltwill also be seen that, the points of contact being small and the friction being slight, the necessity of revolving the lower disk at a high rate of speed is obviated and undue c comminution of the bran is prevented.- By

the use of. the above-described disks breakflourof superior color and strength is readily produced.

I am aware that disks for grinding-mills for 5 the gradual reduction of wheat, having corrugated grinding-surfaces, have been used, and I do not therefore claim such construction, broadly.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, curved inwardly and upwardly toward its cenister, whereby a tapering inclined passage is The combination of the cone-shaped revolvformed between the disks, and their approxiing disk A, having oblique marginal corruga- I mate points of contact are only at or near the 5 tions of uniform size and depth, a smooth 1 outer ends of their corrugations, substantially I5 rounded apex, a smooth coneaved graduallyas and for the purpose described.

rising surface extending from said marginal JOSEPH S. ASH.

corrugations to said apex, with the stationary XVitnesses:

disk B, having oblique marginal corrugations, V. G. OCHS, 10 and its lower surface gradually beveled and JNO. HIscHE. 

